<?php

/*
 * Created on Oct 4, 2008
 *
 * API for MediaWiki 1.8+
 *
 * Copyright (C) 2008 Roan Kattouw <Firstname>.<Lastname>@home.nl
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * http://www.gnu.org/copyleft/gpl.html
 */

if ( !defined( 'MEDIAWIKI' ) ) {
	// Eclipse helper - will be ignored in production
	require_once ( 'ApiQueryBase.php' );
}

/**
 * This query action allows clients to retrieve a list of pages
 * on the logged-in user's watchlist.
 *
 * @ingroup API
 */
class ApiQueryWatchlistRaw extends ApiQueryGeneratorBase {

	public function __construct( $query, $moduleName ) {
		parent :: __construct( $query, $moduleName, 'wr' );
	}

	public function execute() {
		$this->run();
	}

	public function executeGenerator( $resultPageSet ) {
		$this->run( $resultPageSet );
	}

	private function run( $resultPageSet = null ) {
		global $wgUser;

		$this->selectNamedDB( 'watchlist', DB_SLAVE, 'watchlist' );

		if ( !$wgUser->isLoggedIn() )
			$this->dieUsage( 'You must be logged-in to have a watchlist', 'notloggedin' );
		$params = $this->extractRequestParams();
		$prop = array_flip( (array)$params['prop'] );
		$show = array_flip( (array)$params['show'] );
		if ( isset( $show['changed'] ) && isset( $show['!changed'] ) )
			$this->dieUsageMsg( array( 'show' ) );

		$this->addTables( 'watchlist' );
		$this->addFields( array( 'wl_namespace', 'wl_title' ) );
		$this->addFieldsIf( 'wl_notificationtimestamp', isset( $prop['changed'] ) );
		$this->addWhereFld( 'wl_user', $wgUser->getId() );
		$this->addWhereFld( 'wl_namespace', $params['namespace'] );
		$this->addWhereIf( 'wl_notificationtimestamp IS NOT NULL', isset( $show['changed'] ) );
		$this->addWhereIf( 'wl_notificationtimestamp IS NULL', isset( $show['!changed'] ) );

		if ( isset( $params['continue'] ) )
		{
			$cont = explode( '|', $params['continue'] );
			if ( count( $cont ) != 2 )
				$this->dieUsage( "Invalid continue param. You should pass the " .
					"original value returned by the previous query", "_badcontinue" );
			$ns = intval( $cont[0] );
			$title = $this->getDB()->strencode( $this->titleToKey( $cont[1] ) );
			$this->addWhere( "wl_namespace > '$ns' OR " .
					"(wl_namespace = '$ns' AND " .
					"wl_title >= '$title')" );
		}

		// Don't ORDER BY wl_namespace if it's constant in the WHERE clause
		if ( count( $params['namespace'] ) == 1 )
			$this->addOption( 'ORDER BY', 'wl_title' );
		else
			$this->addOption( 'ORDER BY', 'wl_namespace, wl_title' );
		$this->addOption( 'LIMIT', $params['limit'] + 1 );
		$res = $this->select( __METHOD__ );
		
		$db = $this->getDB();
		$titles = array();
		$count = 0;
		while ( $row = $db->fetchObject( $res ) )
		{
			if ( ++$count > $params['limit'] )
			{
				// We've reached the one extra which shows that there are additional pages to be had. Stop here...
				$this->setContinueEnumParameter( 'continue', $row->wl_namespace . '|' .
									$this->keyToTitle( $row->wl_title ) );
				break;
			}
			$t = Title::makeTitle( $row->wl_namespace, $row->wl_title );

			if ( is_null( $resultPageSet ) )
			{
				$vals = array();
				ApiQueryBase::addTitleInfo( $vals, $t );
				if ( isset( $prop['changed'] ) && !is_null( $row->wl_notificationtimestamp ) )
					$vals['changed'] = wfTimestamp( TS_ISO_8601, $row->wl_notificationtimestamp );
				$fit = $this->getResult()->addValue( $this->getModuleName(), null, $vals );
				if ( !$fit )
				{
					$this->setContinueEnumParameter( 'continue', $row->wl_namespace . '|' .
									$this->keyToTitle( $row->wl_title ) );
					break;
				}
			}
			else
				$titles[] = $t;
		}
		if ( is_null( $resultPageSet ) )
			$this->getResult()->setIndexedTagName_internal( $this->getModuleName(), 'wr' );
		else
			$resultPageSet->populateFromTitles( $titles );
	}

	public function getAllowedParams() {
		return array (
			'continue' => null,
			'namespace' => array (
				ApiBase :: PARAM_ISMULTI => true,
				ApiBase :: PARAM_TYPE => 'namespace'
			),
			'limit' => array (
				ApiBase :: PARAM_DFLT => 10,
				ApiBase :: PARAM_TYPE => 'limit',
				ApiBase :: PARAM_MIN => 1,
				ApiBase :: PARAM_MAX => ApiBase :: LIMIT_BIG1,
				ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_BIG2
			),
			'prop' => array (
				ApiBase :: PARAM_ISMULTI => true,
				ApiBase :: PARAM_TYPE => array (
					'changed',
				)
			),
			'show' => array (
				ApiBase :: PARAM_ISMULTI => true,
				ApiBase :: PARAM_TYPE => array (
					'changed',
					'!changed',
				)
			)
		);
	}

	public function getParamDescription() {
		return array (
			'continue' => 'When more results are available, use this to continue',
			'namespace' => 'Only list pages in the given namespace(s).',
			'limit' => 'How many total results to return per request.',
			'prop' => 'Which additional properties to get (non-generator mode only).',
			'show' => 'Only list items that meet these criteria.',
		);
	}

	public function getDescription() {
		return "Get all pages on the logged in user's watchlist";
	}
	
	public function getPossibleErrors() {
		return array_merge( parent::getPossibleErrors(), array(
			array( 'code' => 'notloggedin', 'info' => 'You must be logged-in to have a watchlist' ),
			array( 'show' ),
		) );
	}

	protected function getExamples() {
		return array (
			'api.php?action=query&list=watchlistraw',
			'api.php?action=query&generator=watchlistraw&gwrshow=changed&prop=revisions',
		);
	}

	public function getVersion() {
		return __CLASS__ . ': $Id: ApiQueryWatchlistRaw.php 69578 2010-07-20 02:46:20Z tstarling $';
	}
}